Modelling and simulation of reduce harmonic distortion in non-linear loads

Abstract

Harmonic distortion is a problem that can be caused by the use of power electronic devices. The effect of harmonics has an impact on changes in the input voltage source waveform which is referred to as wave defects. This incident has an impact on electronic faults and overheating of the power transformer coil as a supplier. One cause of the emergence of harmonics is the use of non-linear loads on the electric power system. Utilization of nonlinear loads such as arc fires (metal casting), welding, magnetic core in transformers and rotating machines, synchronous machines, adjustable speed drives, solid-state switches High voltage DC transmission and Photovoltaic invertors can produce input wave defects. The filter is modelled through a reference current which is used as a PWM pulse generator reference signal to trigger the inverter, further generating a filter current that is injected into the system. Inverter control uses the Propositional Integrator (PI) control approach. From the simulation test results using the Psim software, it is shown that the recorded input waves due to harmonic distortion can be corrected by placing an active filter into the power system.